code: def reader_raw(file_path, vocab):
      with PathManager.open(file_path, "r") as r:
          for line in r:
              yield vocab[line.strip()]
  
file_path: pytext/demo/datasource/source.py
imports: import os
  from random import Random
  from typing import Dict, List, Type
  from pytext.common.constants import SpecialTokens
  from pytext.data.sources.data_source import RootDataSource
  from pytext.utils.file_io import PathManager
label_desc: Use image node_id 3 for calling a global function with example usage: reader_raw(file_path, vocab) without return types